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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-370) NaN in "equals" methods
Date Tue, 11 May 2010 11:16:43 GMT

    [ https://issues.apache.org/jira/browse/MATH-370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12866129#action_12866129
] 

Gilles commented on MATH-370:
-----------------------------

> I see no reason to change the names or modify the behavior of any of the other equals
methods in MathUtils. 

Maybe because the other "equals" methods also consider that NaN == NaN which contradicts IEEE
!

Where people need to treat all NaN values as equal, they will use one of the "equalsIncludingNaN",
otherwise they will use one of the "equals" methods (and get an IEEE754-compliant result wrt
to NaN values).


> NaN in "equals" methods
> -----------------------
>
>                 Key: MATH-370
>                 URL: https://issues.apache.org/jira/browse/MATH-370
>             Project: Commons Math
>          Issue Type: Bug
>            Reporter: Gilles
>            Priority: Minor
>
> In "MathUtils", some "equals" methods will return true if both argument are NaN.
> Unless I'm mistaken, this contradicts the IEEE standard.
> If nobody objects, I'm going to make the changes.

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